From: Steven Rostedt <rostedt@goodmis.org>
To: Andi Kleen <ak@suse.de>
Cc: Vinay Venkataraghavan <raghavanvinay@yahoo.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: copy_from_user/copy_to_user question
Date: Sat, 03 Dec 2005 13:26:18 -0500 [thread overview]
Message-ID: <1133634378.6724.16.camel@localhost.localdomain> (raw)
In-Reply-To: <p73hd9p4xmu.fsf@verdi.suse.de>
On Sat, 2005-12-03 at 15:35 -0700, Andi Kleen wrote:
> Steven Rostedt <rostedt@goodmis.org> writes:
> >
> > Nope, the kernel is always locked into memory. If you take a page fault
> > from the kernel world, you will crash and burn. The kernel is never
> > "swapped out". So if you are in kernel mode, going into do_page_fault
> > in arch/i386/mm/fault.c there is no path to swap a page in.
>
> Actually there is - when the page fault was caused by *_user.
Sorry I wasn't clearer. I know the copy_user case (and explained it in
detail earlier in this thread). I was talking about what happens in the
memcpy case. So that should have said "outside of copy_user and
friends, there is no path to swap a page in".
-- Steve
next prev parent reply other threads:[~2005-12-03 18:26 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5fv0G-3kS-11@gated-at.bofh.it>
[not found] ` <5fvam-3vP-9@gated-at.bofh.it>
2005-12-03 2:47 ` copy_from_user/copy_to_user question Robert Hancock
2005-12-03 3:23 ` Steven Rostedt
2005-12-03 3:33 ` Robert Hancock
2005-12-03 4:53 ` Steven Rostedt
2005-12-03 22:35 ` Andi Kleen
2005-12-03 18:26 ` Steven Rostedt [this message]
2005-12-06 17:53 ` Vinay Venkataraghavan
2005-12-06 17:56 ` Arjan van de Ven
2005-12-06 18:23 ` Steven Rostedt
2005-12-06 18:23 ` linux-os (Dick Johnson)
2005-12-06 18:42 ` Steven Rostedt
2005-12-06 19:58 ` linux-os (Dick Johnson)
2005-12-06 20:05 ` Vinay Venkataraghavan
2005-12-02 22:40 Vinay Venkataraghavan
2005-12-03 1:09 ` Steven Rostedt
2005-12-03 1:38 ` Al Viro
2005-12-03 2:02 ` Steven Rostedt
2005-12-03 2:11 ` Vinay Venkataraghavan
2005-12-03 2:22 ` Vinay Venkataraghavan
2005-12-03 2:27 ` Steven Rostedt
2005-12-03 8:33 ` Arjan van de Ven
2005-12-03 9:43 ` Heiko Carstens
2005-12-03 12:14 ` Steven Rostedt
2005-12-03 22:33 ` Andi Kleen
2005-12-05 13:31 ` linux-os (Dick Johnson)
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